The BGS Lexicon of Named Rock Units — Result Details

Ribble Valley Formation

Computer Code: RIBV Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Holocene Epoch (QH)
Lithological Description: Silt, sand and clay in Alluvium grading into gravel at base. River Terraces are dominated by gravel grading upwards into silt and sand.
Definition of Lower Boundary: Probably unconformable, irregular and in places strongly incised into lithologically variable sediments of the Caledonia or Albion Glacigenic Groups or into bedrock.
Definition of Upper Boundary: At the ground surface or unconformable below artificial deposits.
Thickness: Generally less than 5m but locally up to 12m.
Geographical Limits: Lancashire and adjacent areas within the river valley and tributaries of the River Ribble.
Parent Unit: Cumbria-Lancashire Catchments Subgroup (CLCA)
Previous Name(s): Fluvial Parts Of Swettenham And Lytham Formations. (-2393)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Whitbread Brewery Borehole, Preston, BGS Borehole Reference SD523NE/12. 
Type Area  The river valley and tributaries of the River Ribble. 
Reference(s):
Thomas, G S P. 1999. Northern England. 91-98 in Bowen, D Q (Editor), A revised correlation of Quaternary and Neogene deposits in the British Isles. Geological Society Special Report No.23. 
McMillan, A A, Hamblin, R J O and Merritt, J W. 2005. An overview of the lithostratigraphical framework for the Quarternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report RR/04/04. 
Price, D et al. 1963. Geology of the country around Preston. Memoir of the Geological Survey of Great Britain, Sheet 75 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable